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Allis Chalmers Discussion Forum
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Allis B's...water in oil

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Big Al (ME.)

08-10-2007 06:38:06




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Howdy. I have 2 1939 Allis B's....both run smooth, but get the "milkshake" looking oil after running, however coolant does not appear to be entering the combustion chamber. #1 B was given to me with this condition, #2 B was purchased in running condition & within an hour's running developed the same problem. Is this a common issue or am I just lucky? I am an auto mechanic w/ 30 years under my belt & understand the potential causes. Before I tear into one is there a particular weakness or common cause I should look for? (I decided old tractors are a welcome change from electronics, sensors, & computers) Thanks.

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mjourdan

08-11-2007 06:47:06




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
I used to think my B had the same problem because of the way the oil looked - coffee with cream, milky brownish looking oil that even felt gross, not oily when I'd drain it. I checked the freeze plug, put in a new head gasket, and that didn't work, then removed my oil pan and pressurized the cooling system to I think around 15 psi to look for leaks and I found nothing. I then posted a similar question on the other allis forum and two people said they had the same problem and it was because they weren't working their tractors long or hard enough to boil out the condensation. I now have radiator shutters installed and I make a point of keeping the tractor running when I'm doing stop and go wagon work and my oil has stayed good all year and many hours of run time.

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Kent of SWMO

08-11-2007 18:13:32




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
You need a pressurized coolimg system to make the Bars-Leak work well. I do not think a 39 B will have one.

Kent



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old

08-10-2007 10:10:09




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
Dick most likely has it pegged. Freeze plugs, sleeve seal or head gasket. But it could also be a bad sleeve that has rusted out but more then likely one of the other things



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Texas Denny

08-10-2007 10:00:15




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
It sounds to me as though Dick is on the right track. Those freeze plugs are a problem - especially on tractors that have sit a while. You will have to take the valve train off to install new ones.

Other options include bad seals on the cylinder bottoms, bad head gasket, cracked head or a cracked block.



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jeffalex2

08-10-2007 09:19:39




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
If you have the typical exhaust manifold/muffler set up, the muffler runs down into the manifold. Under the right circumstances, it's very easy for rain water to follow the muffler pipe and run down into the engine. I left my B out in a gully washer once, and had to change the oil and clean the pan to get the water out...



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Dick L

08-10-2007 07:38:42




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
It does not take a lot of water mixed into the oil with the crankshaft to make the oil change color. At the age of your tractors the first thing you would want to check is the (freeze plugs) under the rocker arm on top of the head. They can get a pin hole and be very hard to spot. The easiest way to check it is to make sure the radiator is full, the head is and freeze plug well is wiped dry, then add a small amount of air pressure to the radiator. If the leak is not in the freeze plugs the next thing would be to remove the pan and wipe all oil drips dry and watch for water drops. Adding a little air pressure to the radiator will speed up the test.If water drops come from the bottom os a sleeve you would know that an O ring was bad. If the water drops come from the front of the engine you would likely have a bad head gasket. Takes a little time but you can pin point where the water is getting in.

Wiping all drips totally is very important in spotting leaks.

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Jerry Coulter

08-10-2007 09:19:02




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 Re: Allis B's...water in oil in reply to Dick L, 08-10-2007 07:38:42  
Some years back, a production run of new Cadillacs leaked water into the oil pan, GM provided a radiator additive to seal the water jacket. I would check with a Cadillac dealer to see if that additive is available and try it for an easy fix.



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Dick L

08-10-2007 11:33:04




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 Re: Allis B's...water in oil in reply to Jerry Coulter, 08-10-2007 09:19:02  
That was a factory fix for Oliver 1850 heads leaking as well. Probly more but my 1850 had a leak problem after a valve grind. Three different head gaskets were put on and then an old Oliver dealer was ask about it and he said put barsleak in it. He received a bulletin from oliver on it shortly after the 1850 came out.



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Big Al (ME.)

08-10-2007 09:57:08




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 Re: Allis B's...water in oil in reply to Jerry Coulter, 08-10-2007 09:19:02  
Hi, Jerry. GM"s fix, I believe, was Barsleak & is still used today on their assembly line. I"m looking for a fix & not a Bandaid. Thanks anyway.



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Jerry Coulter

08-10-2007 14:39:11




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 09:57:08  
Oh, gosh!! And I bought a new SRX last fall with a V-6 engine. You made my day! Jerry



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bjb in Ne

08-10-2007 06:55:57




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 Re: Allis B's...water in oil in reply to Big Al (ME.), 08-10-2007 06:38:06  
My guess would be either a) leaky head gasket by the lift rods or b) bad O-rings at the base of the sleeves.



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